As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, WITH THE NR 1 INTEGRATED DRIVE GENERATOR ON MEL, LOW OIL PRESSURE LIGHT ILLUMINATED WITH AN APU AUTO SHUTDOWN, LEAVING TWO A/C ELECTRICAL SOURCES INOPERATIVE. DECLARED AN EMERGENCY AND DIVERTED WITHOUT FURTHER INCIDENT. THE AIRCRAFT WAS GROUNDED. REPLACED THE APU LOW OIL PRESSURE SWITCH IAW AMM 49-94-22. OPS CHECKED GOOD.